大功率LED封装用苯基乙烯基硅油的制备及白炭黑的补强研究

第49卷第9期中南大学学报(自然科学版) V ol.49No.9 2018年9月Journal of Central South University (Science and Technology)Sep. 2018 DOI: 10.11817/j.issn.1672-7207.2018.09.004

大功率LED封装用苯基乙烯基硅油的制备及

白炭黑的补强研究

吴海鹰，戴子林，朱淮军，黄建平，杨锐

(广东省稀有金属研究所，广东广州，510651)

摘要：以二甲基硅油、八苯基环四硅氧烷、四甲基二乙烯基二硅氧烷为原料，利用阴离子开环共聚反应制备不同性能的苯基乙烯基硅油并进行表征；以白炭黑为补强材料，考察白炭黑及加入量对基础胶捏合后的黏度及所得加成型硅橡胶性能的影响。研究结果表明：当合成硅油折射率为1.46时，制备的改性白炭黑硅橡胶达到光学透明；

改性白炭黑质量分数为15%的加成型苯基硅橡胶在固化前流动性好，在可见光波长400~800 nm范围内的透光率达92%以上，拉伸强度达5.6 MPa以上，邵尔硬度达60，可见白炭黑补强加成型苯基乙烯硅胶适用于大功率LED 封装。

关键词：LED封装；苯基乙烯基硅油；加成型硅橡胶；白炭黑；补强

中图分类号：TQ264.1 文献标志码：A 文章编号：1672−7207(2018)09−2137−06

Preparation of phenyl vinyl silicone oil for

high power LED package and strengthening of white carbon

WU Haiying, DAI Zilin, ZHU Huaijun, HUAN Jianping, YANG Rui

(Guangdong Research Institute of Rare Metals, Guangzhou 510651, China)

Abstract: Phenyl vinyl silicone oil was prepared by anionic ring-opening copolymerization reaction using dimethicone, octaphenylcyclotetrasiloxane and divinyl tetramethyl disiloxane, and its properties were characterized. The effect of amount of modified silica on the viscosity of the base rubber and the properties of the resultant silicone rubber were investigated using silica as a reinforcing material. The results show that the modified silica rubber is optically transparent when the refractive index of synthetic silicone oil is 1.46; the modified phenyl silicone rubber with modified white carbon mass fraction of 15% has good flowability before solidification; the transmittance under 400−800 nm wavelength is over 92%; the tensile strength is more than 5.6 MPa, and the Shore hardness is 60. Therefore, the prepared phenyl vinyl silicone oil is suitable for LED encapsulation.

Key words: LED package; phenyl vinyl silicone oil; additional silicone rubber; white carbon; strengthening

采用LED(lighting emitting diode)的半导体照明技术被誉为21世纪最具有发展前景的高技术领域之一。LED主要由PN结芯片、电极及封装材料3部分组成，其中封装材料有保护芯片、加速散热及降低芯片与空气的折射率差以增加光输出的作用，在LED的使用中起重要作用[1−6]。传统LED封装材料环氧树脂(EP)具有价格低廉、性能稳定等优点，得到广泛应用，但其也存在耐热性差、折射率偏低、易老化等缺点[7−8]。有机硅独特的结构兼备了无机材料与有机材料的性能，具有耐高温和低温、电气绝缘、耐氧化稳定性、耐候

收稿日期：2018−01−12；修回日期：2018−03−15

基金项目(Foundation item)：广东省科技发展专项资金资助项目(2016B070701023)；广东省科技计划项目(2017A070702020，2017A070701022，2017A070701024)；广州市科技计划项目(201802010065) (Project(2016B070701023) supported by the Scientific and Technology Development Program of Guangdong Province; Projects(2017A070702020, 2017A070701022, 2017A070701024) supported by the Scientific and Technology Program of Guangdong Province; Project(201802010065) supported by the Scientific and Technology Program of Guangzhou City)

通信作者：吴海鹰，高级工程师，从事化工材料研究：E-mail: why64.good@